Single-Dose Metformin Enhances Bile Acid-Induced Glucagon-Like Peptide-1 Secretion in Patients With Type 2 Diabetes

TY - JOUR

T1 - Single-Dose Metformin Enhances Bile Acid-Induced Glucagon-Like Peptide-1 Secretion in Patients With Type 2 Diabetes

AU - Brønden, Andreas

AU - Albér, Anders

AU - Rohde, Ulrich

AU - Rehfeld, Jens F

AU - Holst, Jens J

AU - Vilsbøll, Tina

AU - Knop, Filip K

PY - 2017/11

Y1 - 2017/11

N2 - Context: Despite a position as the first-line pharmacotherapy in type 2 diabetes, the glucose-lowering mechanisms of metformin remain to be fully clarified. Gut-derived modes of action, including suppression of bile acid reabsorption and a resulting increase in glucagon-like peptide-1 (GLP-1) secretion, have been proposed.Objective: The aim of this study was to assess the GLP-1 secretory and glucometabolic effects of endogenously released bile, with and without concomitant single-dose administration of metformin in patients with type 2 diabetes.Design: Randomized, placebo-controlled, and double-blinded crossover study.Setting: This study was conducted at Center for Diabetes Research, Gentofte Hospital, Denmark.Patients: Fifteen metformin-treated patients with type 2 diabetes; all participants completed the study.Interventions: Four experimental study days in randomized order with administration of either 1500 mg metformin or placebo in combination with intravenous infusion of cholecystokinin (0.4 pmol × kg-1 × min-1) or saline.Main Outcome Measure: Plasma GLP-1 excursions as measured by baseline-subtracted area under the curve.Results: Single-dose metformin further enhanced bile acid-mediated induction of GLP-1 secretion (P = 0.02), whereas metformin alone did not increase plasma GLP-1 concentrations compared with placebo (P = 0.17). Metformin, both with (P = 0.02) and without (P = 0.02) concomitant cholecystokinin-induced gallbladder emptying, elicited reduced plasma glucose excursions compared with placebo. No GLP-1-mediated induction of insulin secretion or suppression of glucagon was observed.Conclusions: Metformin elicited an enhancement of the GLP-1 response to cholecystokinin-induced gallbladder emptying in patients with type 2 diabetes, whereas no derived effects on insulin or glucagon secretion were evident in this acute setting.

AB - Context: Despite a position as the first-line pharmacotherapy in type 2 diabetes, the glucose-lowering mechanisms of metformin remain to be fully clarified. Gut-derived modes of action, including suppression of bile acid reabsorption and a resulting increase in glucagon-like peptide-1 (GLP-1) secretion, have been proposed.Objective: The aim of this study was to assess the GLP-1 secretory and glucometabolic effects of endogenously released bile, with and without concomitant single-dose administration of metformin in patients with type 2 diabetes.Design: Randomized, placebo-controlled, and double-blinded crossover study.Setting: This study was conducted at Center for Diabetes Research, Gentofte Hospital, Denmark.Patients: Fifteen metformin-treated patients with type 2 diabetes; all participants completed the study.Interventions: Four experimental study days in randomized order with administration of either 1500 mg metformin or placebo in combination with intravenous infusion of cholecystokinin (0.4 pmol × kg-1 × min-1) or saline.Main Outcome Measure: Plasma GLP-1 excursions as measured by baseline-subtracted area under the curve.Results: Single-dose metformin further enhanced bile acid-mediated induction of GLP-1 secretion (P = 0.02), whereas metformin alone did not increase plasma GLP-1 concentrations compared with placebo (P = 0.17). Metformin, both with (P = 0.02) and without (P = 0.02) concomitant cholecystokinin-induced gallbladder emptying, elicited reduced plasma glucose excursions compared with placebo. No GLP-1-mediated induction of insulin secretion or suppression of glucagon was observed.Conclusions: Metformin elicited an enhancement of the GLP-1 response to cholecystokinin-induced gallbladder emptying in patients with type 2 diabetes, whereas no derived effects on insulin or glucagon secretion were evident in this acute setting.

KW - Journal Article

U2 - 10.1210/jc.2017-01091

DO - 10.1210/jc.2017-01091

M3 - Journal article

C2 - 28938439

SN - 0021-972X

VL - 102

SP - 4153

EP - 4162

JO - The Journal of clinical endocrinology and metabolism

JF - The Journal of clinical endocrinology and metabolism

IS - 11

ER -